Dental jaw model

Abstract

The utility model discloses a tooth jaw model, which is a hollow model enclosed by a thin wall and provided with an opening at the bottom surface, and comprises a tooth jaw part, a base part integrally formed with the tooth jaw part and used for supporting the tooth jaw part, and a reinforcing structure arranged in the base part and used for improving the compressive strength of the tooth jaw model, and the thin wall comprises a lip-cheek side wall and a tongue side wall, the reinforcing structure is arranged across the hollow part of the dental model, one end of the reinforcing structure is supported at a first preset position on the inner surface of the lip-cheek side wall, and the other end of the reinforcing structure is supported at a second preset position on the inner surface of the tongue side wall; the first preset position and the second preset position are arranged corresponding to the same tooth, are respectively arranged at least below canine teeth on the left side and the right side of the patient and second bicuspid teeth, and are arranged at a preset distance from gingival lines of the corresponding teeth; wherein the thickness of the thin wall ranges from 0.5 mm to 3 mm, the reinforcing structure is columnar, and the characteristic diameter of the cross section of the reinforcing structure ranges from 0.5 mm to 3 mm.

Description

Technical Field

[0001] The utility model belongs to the technical field of dental orthodontics, more precisely, it relates to the manufacturing technology of dental instruments, and particularly relates to a dental cast. Background Art

[0002] In the technical field of dental orthodontics, due to advantages such as aesthetics, convenience, and being conducive to cleaning, invisible dental aligners based on polymer materials are becoming increasingly popular. The invisible dental aligner is usually an integral shell that forms a cavity for accommodating multiple teeth, and the geometric shape of this cavity basically matches these teeth in the corresponding layout. Currently, in the automated processing of invisible dental aligners, the preparation process generally includes procedures such as obtaining a digital model of the teeth in the patient's mouth, 3D printing a dental cast, thermoforming, marking, cutting, polishing, sorting invisible aligners, cleaning, and packaging. Among them, during the process of 3D printing the dental cast, a 3D printer is required to perform 3D printing using photosensitive resin as the raw material. If a solid dental cast is printed, it will be a great waste of resin material. In the prior art, commercial software is usually used to perform a shelling and support operation on it to generate a hollow dental digital model with a honeycomb-shaped support structure at the bottom, and then based on this hollow dental digital model, a hollow dental cast with a honeycomb-shaped support structure at the bottom is obtained through 3D printing. This can save photosensitive resin material to a certain extent. However, for this hollow dental cast with a honeycomb-shaped support structure, since its honeycomb structure still has a certain height in the gingivomandibular direction and its honeycomb structure is relatively regular and fixed, it cannot be adapted to different patients' dental casts. During the 3D printing process, there is still a large consumption of photosensitive resin material, especially during the preparation of a large number of invisible aligners, and its cost is very high.

[0003] Therefore, it is highly necessary to provide a dental cast that can meet the compressive strength during thermoforming while being able to save more photosensitive resin material. Summary of the Utility Model

[0004] The technical problem solved by the utility model is to overcome the defects existing in the prior art, and provides a dental cast that can meet the compressive strength during thermoforming while being able to save more photosensitive resin material. It can not only save the raw materials for 3D printing and reduce the raw material cost during production, but also reduce the weight of the dental cast. When the dental casts are transported in batches, it can reduce the transportation cost during transportation, and ultimately reduce the preparation cost of the invisible aligners.

[0005] In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0006] A dental model is a hollow model with an open bottom enclosed by thin walls, including a dental jaw part, a base part integrally formed with the dental jaw part for supporting the dental jaw part, and a strengthening structure disposed within the base part for enhancing the compressive strength of the dental model. The thin walls include a labial-buccal side wall and a lingual side wall. The strengthening structure spans across the hollow part of the dental model, and one end of the strengthening structure is supported at a first preset position on the inner surface of the labial-buccal side wall, while the other end of the strengthening structure is supported at a second preset position on the inner surface of the lingual side wall. The first preset position and the second preset position correspond to the same tooth, and the first preset position and the second preset position are respectively disposed below at least the canines to the second premolars on the left and right sides of the patient and are set at a preset distance from the gingival line of the corresponding tooth. Wherein, the thickness of the thin wall is 0.5 mm - 3 mm, the strengthening structure is columnar, and the characteristic diameter of the cross-section of the strengthening structure is 0.5 mm - 3 mm.

[0007] Preferably, the preset distance is 0 - 0.5 mm.

[0008] Preferably, the cross-section of the strengthening structure is circular or regular polygon.

[0009] Preferably, when the cross-section of the strengthening structure is circular, the characteristic diameter is the diameter of the circle; when the cross-section of the strengthening structure is a regular polygon, the characteristic diameter is the diameter of the circumcircle of the regular polygon.

[0010] Preferably, the characteristic diameters of the cross-sections of the strengthening structure at different positions along its length are equal.

[0011] Preferably, the shapes and sizes of the cross-sections at different positions are the same.

[0012] Preferably, the central axis of the strengthening structure along its length is parallel to the bottom surface of the base part.

[0013] Preferably, the characteristic diameter of the cross-section of the strengthening structure is 1 mm - 2 mm; and / or, the thickness of the thin wall is 0.5 mm - 1.5 mm.

[0014] Preferably, the first preset position and the second preset position can also be respectively disposed below the teeth in the molar regions on the left and right sides of the patient and are set at a preset distance from the gingival line of the corresponding tooth.

[0015] Preferably, the height of the base part in the gingival-jaw direction is 2 mm - 8 mm.

[0016] Compared with the prior art, the present utility model adopts the above technical solutions and has at least one of the following beneficial effects:

[0017] (1) The dental model provided by the present utility model is provided with a strengthening structure for enhancing the compressive strength of the dental model on the inner side wall of the base part of the hollow dental model, and the wall thickness of the thin wall of the hollow dental model and the characteristic diameter of the cross-section of the strengthening structure are defined. On the one hand, while meeting the compressive performance during pressure molding, it can save more photosensitive resin materials for the dental model, not only saving the raw materials for 3D printing and reducing the raw material cost during production; on the other hand, it also reduces the weight of the dental model, and during the batch transportation of the dental model, it can reduce the transportation cost incurred during transportation; ultimately reducing the preparation cost of the invisible orthodontic appliance; in addition, the dental model of the present utility model sets the adding position of the strengthening structure based on the gingival line position of different patients, which can meet the personalized needs of different dental models of different patients.

[0018] (2) The present utility model sets the strengthening structure as a cylinder, that is, the cross-section of the strengthening structure is circular. When meeting the pressure molding strength, it can further save photosensitive resin materials because, in the case of the same volume, the strengthening structure with a circular cross-section consumes the least amount of materials.

[0019] (3) The present utility model sets the central axis of the strengthening structure along the length direction parallel to the bottom surface of the base part, thereby reducing the length dimension of the strengthening structure, which is beneficial to further reducing the consumption of photosensitive resin. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not limit the embodiments. Elements with the same numerical reference numerals represent similar elements. Unless otherwise stated, the figures in the drawings do not constitute a scale limitation.

[0021] Figure 1 It is a schematic structural view of the dental model in Embodiment 1 of the present utility model;

[0022] Figure 2 It is a schematic structural view of the dental model in Embodiment 1 of the present utility model from another angle;

[0023] Figure 3 is Figure 2 a partial enlarged view of area A in

[0024] Figure 4 is Figure 1 a partial enlarged view of area C in

[0025] Figures 5 to 9 It is a schematic cross-sectional view of different strengthening structures in Embodiment 1 of the present utility model;

[0026] Figure 10This is a schematic structural diagram of the dental cast in the first embodiment of the present utility model from another angle;

[0027] Figure 11 This is a schematic structural diagram of the dental cast in the second embodiment of the present utility model;

[0028] Figure 12 This is a schematic structural diagram of the dental cast in the third embodiment of the present utility model. Detailed implementation manners

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will elaborate on each implementation manner of the present utility model in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that in each implementation manner of the present utility model, many technical details are provided for the readers to better understand the present utility model. However, even without these technical details and various changes and modifications based on the following implementation manners, the technical solutions claimed by the present utility model can still be achieved. The division of the following embodiments is for convenience of description and should not constitute any limitation to the specific implementation manner of the present utility model.

[0030] The directional terms such as "upper", "lower", "left", and "right" used in the description herein are the directions in the drawings and do not refer to special limitations.

[0031] The "posterior tooth area" mentioned in each embodiment of the present utility model is defined according to the classification of teeth on pages 36 - 38 of the second edition of "Introduction to Stomatology" published by Peking University Medical Press, including premolars and molars, teeth marked as 4 - 8 in the FDI notation, and teeth marked as 1 - 3 in the FDI notation in the anterior tooth area. The teeth in the anterior tooth area include central incisors, lateral incisors, and canines.

[0032] As can be seen from the background technology, in the prior art based on the 3D printing process, it is necessary to first use a 3D printer to perform 3D printing with photosensitive resin as the raw material to obtain a solid dental cast. However, the existing dental casts are generally solid dental casts or hollow dental casts with a honeycomb - shaped support structure. Even in the latter case, due to the fact that its honeycomb structure still has a certain height in the gingival - occlusal direction and its honeycomb structure is relatively regular and fixed, it cannot be adapted to the dental casts of different patients. During the 3D printing process, there is still a large consumption of photosensitive resin material. Especially during the preparation of large - scale invisible orthodontic appliances, the cost is very high.

[0033] Based on this, the applicant proposes a dental model, which is a hollow model with an open bottom enclosed by thin walls. It includes a dental part, a base part integrally formed with the dental part for supporting the dental part, and a strengthening structure disposed within the base part for enhancing the compressive strength of the dental model. The thin walls include a labiobuccal side wall and a lingual side wall. The strengthening structure is disposed across the hollow part of the dental model, and one end of the strengthening structure is supported at a first preset position on the inner surface of the labiobuccal side wall, and the other end of the strengthening structure is supported at a second preset position on the inner surface of the lingual side wall; the first preset position and the second preset position correspond to the same tooth, and the first preset position and the second preset position are respectively disposed below at least the canines to the second premolars on the left and right sides of the patient and are set at a preset distance from the gingival line of the corresponding tooth; wherein, the thickness of the thin wall is 0.5 mm - 3 mm, the strengthening structure is columnar, and the characteristic diameter of the cross section of the strengthening structure is 0.5 mm - 3 mm. Through film pressing finite element simulation and a large amount of test data, the applicant first limits the thickness of the thin wall of the dental model and the characteristic diameter of the cross section of the strengthening structure within the range that satisfies the film pressing strength, and then through the structure and position setting of the strengthening structure, on the one hand, while meeting the compressive performance during film pressing, it can more effectively save the photosensitive resin material for the dental model, not only saving the raw materials for 3D printing and reducing the raw material cost during production; on the other hand, it can also reduce the weight of the dental model, and when the dental models are transported in batches, it can reduce the transportation cost incurred during transportation; ultimately reducing the preparation cost of the invisible orthodontic appliance; in addition, the dental model of the present utility model sets the adding position of the strengthening structure based on the gingival line positions of different patients, which can meet the personalized needs of different dental models for different patients.

[0034] Example 1

[0035] Please refer to Figures 1 to 4As shown in the figure. The present application provides a dental model 100, which is a hollow model enclosed by a thin wall 10 with an open bottom surface, and includes a dental part 1, a base part 2, and a strengthening structure 3. The dental part 1 is consistent with the current tooth layout or the target tooth layout of the patient, and can usually be formed by processing after being scanned by an intraoral scanning device. The thin wall 10 includes an inner surface 30 near the hollow part of the hollow model and an outer surface 20 away from the hollow part. The thickness H of the thin wall 10, that is, the thickness between the inner surface 30 and the outer surface 20 of the thin wall, is 0.5 mm - 3 mm. The base part 2 can usually be formed by scanning the real gums of the patient, or by performing virtual gum design based on the tooth layout obtained by scanning, and is mainly used to support the dental part 1. In the present application, the base part 2 and the dental part 1 are integrally formed. Such an integrally formed structure and the setting of the thin wall thickness of 0.5 mm - 3 mm make the dental model 100 have a certain compressive strength as a whole, so as to ensure that the dental model will not deform during the thermoforming process. The strengthening structure 3 is arranged in the base part 2 and is used to enhance the compressive strength of the dental model 100. The strengthening structure 3 is arranged across the hollow part of the dental model 100. Specifically, with respect to the patient's teeth, the hollow model includes a lingual side wall 5 near the patient's tongue and a labial and buccal side wall 4 near the patient's labial and buccal sides. One end of the strengthening structure 3 is supported at a first preset position (not labeled) on the inner surface of the labial and buccal side wall 4, and the other end of the strengthening structure 3 is supported at a second preset position B1 on the inner surface of the lingual side wall 5. The first preset position and the second preset position correspond to the same tooth setting, and the first preset position and the second preset position are respectively arranged at least below the canines to the second premolars on the left and right sides of the patient and are set at a preset distance L from the gum line of the corresponding teeth, that is, the teeth No. 3 to No. 5 on both the left and right sides. Such a design is based on the inventor's discovery in the stress analysis during thermoforming that usually, during the thermoforming process, the stress in the area below the canines to the second premolars on the left and right sides of the dental model is relatively concentrated and is prone to cracking. By adding a strengthening structure here, the compressive strength of the dental model can be enhanced, so as to ensure the smooth progress of the thermoforming process. For example, for the strengthening structure arranged corresponding to the position of the patient's left canine, one end of it is supported at the gum line position on the inner surface of the buccal side wall corresponding to the patient's left canine, and the other end is supported at the gum line position on the inner surface of the lingual side wall corresponding to the patient's left canine; or both ends of the strengthening structure are respectively supported at the preset distance positions below the gum line on the inner surfaces of the buccal side wall and the lingual side wall corresponding to the patient's left canine.Among them, the reinforcing structure is columnar, with both ends respectively supported on the inner surface of the base portion 2. The characteristic diameter D of the cross-section of the reinforcing structure 3 is 0.5 mm - 3 mm. Herein, the characteristic diameter D refers to the representative diameter dimension of the cross-section of the reinforcing structure 3. In this application, it refers to the diameter dimension of the cross-section of the reinforcing structure 3 that can enable the dental and maxillofacial model 100 to meet the compressive strength during thermoforming. Herein, the cross-section refers to the cross-section of the reinforcing structure 3 along the gingivomaxillary direction. In some other embodiments, the characteristic diameter D of the cross-section of the reinforcing structure 3 is preferably 1 mm - 2 mm. Setting the characteristic diameter of the cross-section of the reinforcing structure 3 to be greater than 1 mm facilitates ensuring that the reinforcing structure 3 can be applicable to the compressive strength of dental and maxillofacial models of most sizes during thermoforming. While setting the characteristic diameter of the cross-section of the reinforcing structure 3 to be less than 2 mm is to reduce the amount of photosensitive resin consumed in printing the dental and maxillofacial model 100 on the premise of meeting the compressive strength. In some other embodiments, the thickness H of the thin wall 10 is preferably 0.5 mm - 1.5 mm. Generally, the thicker the thickness H of the thin wall 10, the greater the compressive strength of the dental and maxillofacial model 100 during thermoforming, and the more photosensitive resin is consumed. In the inventor's verification, when the wall thickness H of the thin wall 10 is less than 0.5 mm, the compressive strength of the dental and maxillofacial model 100 cannot be guaranteed. When the thickness H of the thin wall 10 is designed within 0.5 mm - 1.5 mm, it is beneficial to save the amount of photosensitive resin while ensuring the compressive strength. In some other embodiments, the characteristic diameter D of the cross-section of the reinforcing structure 3 is preferably 1 mm - 2 mm, and the thickness H of the thin wall 10 is preferably 0.5 mm - 1.5 mm. The reinforcing structure 3 and the thin wall 10 within such a size range can meet the compressive strength of the dental and maxillofacial model 100 during thermoforming, and can save the amount of photosensitive resin to a large extent, thereby ultimately reducing the production cost of the invisible orthodontic appliance.

[0036] Further explanation, generally, by performing intraoral scanning on the patient's oral cavity, a solid dental and maxillofacial digital model can be obtained through computer data conversion. Topological optimization is performed on this solid dental and maxillofacial digital model to obtain a hollow dental and maxillofacial digital model, and the hollow model surrounded by thin walls as described in this application is obtained through 3D printing.

[0037] In some embodiments, please continue to refer to Figure 2 and Figure 3 , the preset distance L is 0 - 0.5 mm. It should be noted that for the convenience of illustration, Figure 2 and Figure 3In it, positions B2 and the gingival line 40 respectively show schematic diagrams of the second preset position B1 where the reinforcing structure 3 is supported on the inner surface of the lingual sidewall 5 of the dental arch model 100 and the position of the gingival line on the inner surface of the lingual sidewall 5 corresponding to the corresponding position on the outer surface of the lingual sidewall 5. For the convenience of illustration only, it does not mean that the reinforcing structure 3 is supported on the outer surface of the lingual sidewall 5 of the dental arch model 100. In this application, such a preset distance setting is obtained by the inventor through a large number of thermoforming finite element calculations when determining the installation position of the reinforcing structure 3. Adding the reinforcing structure 3 within this preset distance range can meet the compressive strength of the dental arch model 100 during thermoforming. Further explanation: After obtaining the hollow model, the inventor first conducts thermoforming finite element calculations on the hollow model to obtain the stress distribution of the hollow model, and then extracts the position of the maximum stress area below the gingival line of each tooth on the sidewall of the hollow part. This position is used as the preset position for adding the reinforcing structure 3. The preset position includes a first preset position supported on the inner surface of the labial and buccal sidewalls of the hollow model and a second preset position supported on the inner surface of the lingual sidewall of the hollow model. The first preset position or the second preset position is respectively set at the preset distance L from the gingival line at the corresponding tooth. Among them, the preset distance L is 0 - 0.5 mm, that is, the first preset position or the second preset position is the position of the gingival line on the inner surface of the labial and buccal sidewalls 4 or the lingual sidewall 5 of the hollow model or a position within 0.5 mm below the gingival line.

[0038] Further explanation: The range of the preset distance can be applicable to the vast majority of patients. For different patients, in this application, only the position of the gingival line at the corresponding tooth of the patient needs to be obtained, and then the specific first preset position and second preset position can be determined according to the gingival position, and then the reinforcing structure can be added.

[0039] In some embodiments, as Figure 5 shown, the cross-section of the reinforcing structure 3 is circular, that is, the reinforcing structure 3 is a cylinder, and its characteristic diameter D is the diameter of the circle. The design of the cylinder is relatively simple in processing and has small processing errors. In other embodiments, the cross-section of the reinforcing structure 3 is a regular polygon, that is, the reinforcing structure 3 is a prism with a regular polygon cross-section, and its characteristic diameter D is the diameter of the circumscribed circle of the regular polygon, that is, all vertices of the regular polygon fall on the circumference of the circumscribed circle. As Figures 6 to 9 shown, the cross-section of the reinforcing structure 3 can be an equilateral triangle, a square, a regular pentagon, a regular octagon, etc. It can be understood that when the thermoforming strength is satisfied, the reinforcing structure with other cross-sectional shapes, for example, a columnar structure with a trapezoidal cross-section or a columnar structure with other irregular polygon cross-sections, can also be applied to this application when it meets the thermoforming strength.

[0040] In some embodiments, the characteristic diameters of the cross-sections of the reinforcing structure 3 at different positions in its length direction are all equal. In the present application, the length direction of the reinforcing structure 3 is the direction from the buccal-lingual side to the lingual side of the reinforcing structure. Further, when the characteristic diameters of the cross-sections are all equal, the shapes and sizes of the cross-sections at different positions are the same, that is, the cross-sectional shapes and sizes of the reinforcing structure 3 along the length direction are consistent. Such a design is beneficial to processing and production. Moreover, it can make the stress on each region of the reinforcing structure 3 in its length direction equal, which can ensure the reliability of the reinforcing structure 3 itself and prevent it from breaking due to stress concentration in some regions, thereby ensuring the compressive strength of the dental arch model 100.

[0041] In some embodiments, the central axis of the reinforcing structure 3 along the length direction is arranged parallel to the bottom surface of the base portion 2. Generally, the points on the bottom surface of the base portion are all located in the same horizontal plane, which is beneficial to ensuring the stability during the thermoforming process. When adding the reinforcing structure 3, arranging the central axis of the reinforcing structure 3 along the length direction parallel to the bottom surface of the base portion can obtain a reinforcing structure with a smaller length compared to arranging the central axis of the reinforcing structure along the length direction obliquely to the bottom surface of the base portion, thereby further reducing the consumption of photosensitive resin.

[0042] In some embodiments, please refer to Figure 10 As shown, the height h of the base portion 2 in the gingival-occlusal direction is 2 mm - 8 mm. That is, the height of the gingival line position of the dental arch portion 2 from the plane S of the bottom surface of the corresponding base portion. Generally, the height of the anterior tooth area of the base portion 2 in the gingival-occlusal direction is higher than the height of the posterior tooth area of the base portion 2 in the gingival-occlusal direction. In the present application, the height is taken as the height of the posterior tooth area of the base portion 2. Further explanation, generally, the dental arch portion of the dental arch model is obtained by scanning the patient's real tooth conditions, which vary from person to person. The base portion can be made according to the patient's real gingival conditions or generated manually according to parameters, and its height is adjustable. Usually, the height of the entire dental arch model can be controlled by adjusting the height of the base portion. In the present application, the height range of the base portion is controlled within 2 mm - 8 mm. Such a height range, on the one hand, is the height verified by the inventor in experiments to meet the compressive strength during thermoforming. On the other hand, by controlling the height range of the base portion to control the overall height of the entire dental arch model, it can also ensure that the thickness of the invisible orthodontic appliance formed by thermoforming on it meets the orthodontic requirements. That is, since the film sheet specifications for thermoforming on it are the same, for a dental arch model with a lower height, compared to a dental arch model with a higher height, the thickness of the invisible orthodontic appliance obtained by thermoforming is thicker, and the orthodontic force generated when the patient wears it on the dental arch is greater, which is suitable for the need of a greater orthodontic force.

[0043] Example 2

[0044] To solve the technical problem to be solved by the present utility model, please refer to Figure 11 As shown, the present application further provides a dental cast 100. The first preset position and the second preset position can also be respectively set below the teeth in the molar regions on the left and right sides of the patient and at a preset distance from the gingival line of the corresponding teeth. The difference between the dental cast 100 of this embodiment and the dental cast in Embodiment 1 is only that, in addition to the positions corresponding to the teeth from the canines to the second premolars on the left and right sides of the patient and at a preset distance from the gingival line of the corresponding teeth described in Embodiment 1, the strengthening structure 3 can also be added at the positions corresponding to the teeth in the molar regions on the left and right sides of the patient and at a preset distance from the gingival line of the corresponding teeth. With such a design, the compressive strength of the dental cast 100 can be further increased, especially suitable for patients with a relatively wide buccolingual dimension in the posterior tooth region. Usually, when the buccolingual dimension in the posterior tooth region is relatively wide, during thermoforming, the thin walls in the posterior tooth region of the dental cast may be torn towards the buccal and lingual sides due to the pressure during thermoforming, resulting in the failure of thermoforming.

[0045] Example 3

[0046] To solve the technical problem to be solved by the present utility model, please refer to Figure 12 As shown, the present application further provides a dental cast 100. The difference between the dental cast 100 of this embodiment and the dental cast in Embodiment 2 is only that, in addition to the positions corresponding to the teeth from the canines to the second premolars on the left and right sides of the patient and at a preset distance from the gingival line of the corresponding teeth, and the positions corresponding to the teeth in the molar regions on the left and right sides of the patient and at a preset distance from the gingival line of the corresponding teeth described in Embodiment 2, the strengthening structure can also be added at the positions corresponding to the central incisors and lateral incisors of the patient and at a preset distance from the gingival line of the corresponding teeth. With such a design, the compressive strength of the dental cast can be further increased. Generally, the buccolingual width of the central incisors and lateral incisors is relatively small, the volume of the hollow part corresponding to the central incisors and lateral incisors is relatively small, and their overall compressive performance is relatively strong. During thermoforming, the strengthening structure may not be added, but in production, it can be judged according to different cases. When the compressive strength of the corresponding region is relatively weak, this embodiment can be applied for addition.

[0047] It should be noted that, without contradiction, the above embodiments can be freely combined as needed to form different new implementation schemes. The implementation schemes formed after such combination are all within the protection scope of the present application. For the sake of saving the space of the application text, it will not be elaborated here.

[0048] The above are only the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model creation, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

[0049] Similarly, the above are only the specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art in this technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, and all should be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claimed rights.

Claims

1. A dental cast model is a hollow model with an open bottom enclosed by thin walls, characterized in that, It includes a dental and maxillofacial part, a base part integrally formed with the dental and maxillofacial part for supporting the dental and maxillofacial part, and a strengthening structure arranged in the base part for enhancing the compressive strength of the dental and maxillofacial model. The thin wall includes a labiobuccal side wall and a lingual side wall. The strengthening structure is arranged across the hollow part of the dental and maxillofacial model, and one end of the strengthening structure is supported at a first preset position on the inner surface of the labiobuccal side wall, and the other end of the strengthening structure is supported at a second preset position on the inner surface of the lingual side wall; the first preset position and the second preset position correspond to the same tooth, and the first preset position and the second preset position are respectively arranged below at least the canines to the second premolars on the left and right sides of the patient and are arranged at a preset distance from the gingival line of the corresponding tooth; wherein, the thickness of the thin wall is 0.5 mm - 3 mm, the strengthening structure is columnar, and the characteristic diameter of the cross-section of the strengthening structure is 0.5 mm - 3 mm.

2. The dental arch model according to claim 1, characterized in that The preset distance is 0 - 0.5 mm.

3. The dental arch model according to claim 1, characterized in that, The cross-section of the strengthening structure is circular or regular polygon.

4. The dental model according to claim 3, wherein When the cross-section of the strengthening structure is circular, the characteristic diameter is the diameter of the circle; when the cross-section of the strengthening structure is a regular polygon, the characteristic diameter is the diameter of the circumcircle of the regular polygon.

5. The dental arch model according to claim 1, characterized in that, The characteristic diameters of the cross-sections of the strengthening structure at different positions in its length direction are equal.

6. The dental arch model according to claim 5, characterized in that, The shapes and sizes of the cross-sections at different positions are the same.

7. The dental arch model according to claim 6, characterized in that, The central axis of the strengthening structure along its length direction is arranged parallel to the bottom surface of the base part.

8. The dental arch model according to claim 1, wherein, The characteristic diameter of the cross-section of the strengthening structure is 1 mm - 2 mm; and / or, the thickness of the thin wall is 0.5 mm - 1.5 mm.

9. The dental arch model according to claim 1, wherein The first preset position and the second preset position can also be respectively arranged below the teeth in the molar regions on the left and right sides of the patient and are arranged at a preset distance from the gingival line of the corresponding tooth.

10. The dental arch model according to claim 1, characterized in that, The height of the base part in the gingivomaxillary direction is 2 mm - 8 mm.

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